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Home >> Chevrolet >> 1999 >> Venture V6-3.4L VIN E >> Repair and Diagnosis >> Relays and Modules >> Relays and Modules - Restraints and Safety Systems >> Air Bag Control Module >> Description and Operation >> Inflatable Restraint Side Impact (SISM) Module
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Inflatable Restraint Side Impact (SISM) Module

The Inflatable Restraint side impact sensors (SIS) are crash-sensing devices used in the detection of side impact collisions. The Inflatable Restraint side impact sensor (LH) is located in the LH B-pillar. The Inflatable Restraint side impact sensor (RH) is located in the RH B-pillar. The Inflatable Restraint side impact sensors are used to perform the following functions:
^ Side Impact Crash Detection - Each SIS monitors vehicle velocity changes to detect side impact crashes that are severe enough to warrant deployment.
^ Side Air Bag System Status Communication - The Inflatable Restraint Sensing and Diagnostic Module (SDM) monitors a diagnostic line from each SIS. Both SISs communicate the status of the side impact air bag system to the SDM over these diagnostic lines.

The SIS connects to the air bag wiring harness using a 2-way connector.

The SIS receives power via the SDM whenever the ignition switch is in the RUN or START positions.

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